def default_route_crud_operations()

in source/state_machine_handler.py [0:0]

• 34 lines of code
• 6 McCabe index (conditional complexity)

    def default_route_crud_operations(self):
        try:
            self.logger.info("Executing: " + self.__class__.__name__ + "/" + inspect.stack()[0][3])
            # this condition will be met if VPC tagged not Subnet

            if self.event.get('SubnetId') is not None:
                ec2 = self._session(self.spoke_region, self.spoke_account_id)

                existing_routes = self._describe_route_tables_for_subnet()

                # handles the case if the subnet has no association with
                # explicit route table
                if existing_routes is None:
                    return self.event

                # allowed values in hub CFN template
                # "All-Traffic (0/0)"
                # "RFC-1918 (10/8, 172.16/12, 192.168/16)"
                # "Custom Destinations"
                # "Configure-Manually
                quad_zero_route = environ.get('ALL_TRAFFIC')   # 0.0.0.0/0
                rfc_1918_routes = convert_string_to_list(
                    environ.get('RFC_1918_ROUTES'))

                if "All-Traffic" in environ.get('DEFAULT_ROUTE'):
                    self._find_existing_default_route(existing_routes,
                                                      quad_zero_route)
                    self._update_route_table(ec2, quad_zero_route)
                elif "RFC-1918" in environ.get('DEFAULT_ROUTE'):
                    for route in rfc_1918_routes:
                        self._find_existing_default_route(existing_routes,
                                                          route)
                        self._update_route_table(ec2, route)
                elif "Custom-Destinations" in environ.get('DEFAULT_ROUTE'):
                    self.update_route_table_with_cidr_blocks(ec2,
                                                             existing_routes)
                    self.update_route_table_with_prefix_lists(ec2,
                                                              existing_routes)

                elif "Configure-Manually" in environ.get('DEFAULT_ROUTE'):
                    self.logger.info('Admin opted to configure route '
                                     'table manually')

            return self.event

        except Exception as e:
            message = self._message(inspect.stack()[0][3], e)
            self.logger.exception(message)
            self._update_ddb_failed(e)
            raise